Here is the full list of all 97 Divinity: Original Sin 2 achievements. It takes around 200 hours to unlock all of the achievements on Windows.
Lohse: Banish your demon
Lohse: Embrace your demon
Beast: Ally with the Queen
Beast: Assassinate the Queen
Learn of the Council of Seven's location from a higher power
Set Gareth on a path of reconciliation
Purge Rivellon of all Source
Fane: Embrace this strange new world
Fane: Return the Eternals to Rivellon
Complete the game in Tactician Mode
Complete the game in Honour Mode
Share Divinity with The Doctor
The Red Prince: Become the father of dragons
The Red Prince: Kill the Red Princess
Convince Alexandar to ally with you
Swear to the Covenant
Destroy every Voidwoken egg in Reaper's Cove
Learn of the Council of Seven's location from Malady
Take the ferry to Bloodmoon Island
Tame Featherfall
Lockpick your way into Mordus' hidden lair
Gain the Villain tag
Force Dallis to retreat from combat in Fort Joy
Successfully begin a match in Arena Mode
Successfully begin a Game Master session
Obtain Anathema
Share Source with all of Rivellon
Ascend to Divinity
Complete the game in Explorer Mode
Complete the game in Classic Mode
Submit to the God King
Defeat Adramahlihk
Defeated the Kraken
Ifan: Kill Lucian
Ifan: Forgive Lucian
Shapeshift into every race
Successfully walk the Path of Blood
Gain entrance to Lucian's Crypt without following the Path of Blood
Craft a grenade
Use the Curse skill
Craft a scroll
Make a deal with Adramahlihk
Persuade Toyseller Sanders to give you his amulet
Rescue Arhu
Discover Reimond's Lair
Arrive at Arx
Enter The Arena of the One
Discover the hidden entrance to the Academy
Enter the Academy
Convince all party members to let you ascend
Sebille: Destroy the Mother Tree
Sebille: Serve the Mother Tree
Sebille: Kill the Master
Pray at every altar on the Nameless Isle
Arrive at the Nameless Isle
Awaken the corrupted Ancestor Tree on Bloodmoon Island
Learn of the Council of Seven's location from The Advocate
Equip runes to all of an item's available slots
Correctly answer all of Crispin's questions
Perform successful surgery on Natalie
Escort Saheila outside without fighting the Lone Wolves
Set Gareth on a path of vengeance
Receive Dorotya's kiss
Serve Garvan the tainted stew
Become champion of the Driftwood Arena
Speak to an animal's spirit
Help free Mari from the Voidwoken
Escape Dallis' siege on the Lady Vengeance after killing every minion
Kill Slane
Unlock your third Source Point slot
Perform a successful theft
Kill Andras, the necromantic dog
Craft a skill
Escort the Black Cat out of Fort Joy
Get caught breaking the law
Become champion of the Fort Joy arena
Unlock your second Source Point slot
Adopt Peeper
Meet Meistr Siva
Arrive at Reaper's Coast
Enter the Hall of Echoes
Escape Dallis' siege on the Lady Vengeance without killing every minion
Take command of the Lady Vengeance
Welcome Tarquin to the Seekers' service
Kill Radeka
Defeat Alexandar in Fort Joy
Use your first Source Skill
Face a higher power
Remove your Source Collar
Win a persuasion event
Arrive at the Sanctuary of Amadia
Rescue Gareth from Braccus' Armoury
Kill an enemy using Teleportation
Flee Fort Joy for good
Gain the Hero tag
Escape the kraken's clutches
Arrive at Reaper's Eye